Characterization of point defects in CdTe by positron annihilation spectroscopy

Positron lifetime measurements on CdTe 0.15% Zn-doped by weight are presented, trapping to monovacancy defects is observed. At low temperatures, localization at shallow binding energy positron traps dominates. To aid defect identification density functional theory, calculated positron lifetimes and...

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Bibliographic Details
Published in:Applied physics letters 2016-06, Vol.108 (24)
Main Authors: Elsharkawy, M. R. M., Kanda, G. S., Abdel-Hady, E. E., Keeble, D. J.
Format: Article
Language:English
Subjects:
Applied physics
BINDING ENERGY
CADMIUM TELLURIDES
CHARGE STATES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DENSITY FUNCTIONAL METHOD
Density functional theory
DISTRIBUTION
Divacancies
DOPED MATERIALS
Mathematical analysis
Point defects
Positron annihilation
POSITRON ANNIHILATION SPECTROSCOPY
POSITRONS
Spectroscopic analysis
Spectrum analysis
TRAPPING
TRAPS
Weight
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Summary:Positron lifetime measurements on CdTe 0.15% Zn-doped by weight are presented, trapping to monovacancy defects is observed. At low temperatures, localization at shallow binding energy positron traps dominates. To aid defect identification density functional theory, calculated positron lifetimes and momentum distributions are obtained using relaxed geometry configurations of the monovacancy defects and the Te antisite. These calculations provide evidence that combined positron lifetime and coincidence Doppler spectroscopy measurements have the capability to identify neutral or negative charge states of the monovacancies, the Te antisite, A-centers, and divacancy defects in CdTe.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4953781